Transcription of Technical Bulletin - Vecom
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Technical Bulletin - Vecom
Number: 2005/17 October 2005 THE passivation OF steel Introduction It is known that the chromium content of stainless steel is important for the formation of a passive film, the chromium oxide skin. This chromium oxide skin is formed spontaneously in the air and in this way it protects the underlying material. Construction steel (also called carbon steel ) does not have this property, because of the absence of chromium as the alloying element. However, a reaction with the oxygen from the air does take place. The active iron reacts to give iron oxides. The underlying material is not protected, because, as a rule, iron oxides, which are bulky and hygroscopic, do not adhere to the underlying material. Furthermore, under the influence of moisture and oxygen, the oxidation continues until a red-brown rust has been formed.
Passivation process The standard treatment for the chemical passivation of steel consists of a number of steps. Often, a number of “pre-cleaning steps” are necessary before the actual passivation process can be …
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